| 摘要 |
PROBLEM TO BE SOLVED: To devise structure of a mold die and structure of an optical disk so that lowering of quality of pasted optical disks in appearance is prevented, high flatness of a clamp area is secured, a maintenance cycle of a die is lengthened and efficiency of production of a disk is further enhanced. SOLUTION: Regarding the optical disk constituted by providing a center hole and an information surface 19 formed by transcribing a guide groove by a stamper and pasting two substrates 12a, 12b constituted by forming a recessed groove part 20 on the side of the inner circumference of the information surface inside out by setting the information surface inside via an adhesive layer, the optical disk is constituted by adhering two substrates with different dimensions of external diameter of recessed groove parts to be formed on the side of the inner circumference of the information surface. Consequently, lowering of quality in appearance, lowering of the flatness of the clamp area 17 due to overlap of burrs are surely evaded since a radius direction and position of the burr 14 to be formed on the pasted surface are different. |
